Rock, Frozen Soil and Ice Breakage by High-frequency Electromagnetic Radiation
Author : Pieter Hoekstra
Publisher :
Page : 28 pages
File Size : 47,85 MB
Release : 1976
Category : Dielectric heating
ISBN :
Author : Pieter Hoekstra
Publisher :
Page : 28 pages
File Size : 47,85 MB
Release : 1976
Category : Dielectric heating
ISBN :
Author :
Publisher :
Page : 21 pages
File Size : 38,44 MB
Release : 1976
Category :
ISBN :
In the past decade, various workers have investigated the use of high-frequency electromagnetic radiation for breaking and excavating rock and frozen ground. This report reviews the high-frequency dielectric properties of these materials, the physics of heating, and the existing literature on these subjects. The high-frequency dielectric properties of rocks and soils, and the absorption of energy by these materials, are mainly determined by their liquid water contents. Computer modeling was used to calculate absorption energy as a function of distance behind irradiated faces of earth materials. The resulting computations showed that most energy is absorbed in the first few centimeters of frozen ground and weak soils. However, in hard rocks of low water content, electromagnetic waves penetrate more deeply, and significant amounts of energy are also absorbed tens of centimeters behind the irradiated faces. Test results showed that electromagnetic rock breakage is feasible only for excavations in hard rock; test results from the use of electromagnetic radiation for excavating tunnels in weak rocks and frozen ground are not promising. (Author).
Author :
Publisher :
Page : 21 pages
File Size : 38,10 MB
Release : 1976
Category :
ISBN :
In the past decade, various workers have investigated the use of high-frequency electromagnetic radiation for breaking and excavating rock and frozen ground. This report reviews the high-frequency dielectric properties of these materials, the physics of heating, and the existing literature on these subjects. The high-frequency dielectric properties of rocks and soils, and the absorption of energy by these materials, are mainly determined by their liquid water contents. Computer modeling was used to calculate absorption energy as a function of distance behind irradiated faces of earth materials. The resulting computations showed that most energy is absorbed in the first few centimeters of frozen ground and weak soils. However, in hard rocks of low water content, electromagnetic waves penetrate more deeply, and significant amounts of energy are also absorbed tens of centimeters behind the irradiated faces. Test results showed that electromagnetic rock breakage is feasible only for excavations in hard rock; test results from the use of electromagnetic radiation for excavating tunnels in weak rocks and frozen ground are not promising. (Author).
Author : Cold Regions Research and Engineering Laboratory (U.S.)
Publisher :
Page : 610 pages
File Size : 50,72 MB
Release : 1976
Category : Frozen ground
ISBN :
Author : United States. Superintendent of Documents
Publisher :
Page : 1228 pages
File Size : 24,44 MB
Release : 1978
Category : Government publications
ISBN :
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Author :
Publisher :
Page : 1006 pages
File Size : 39,36 MB
Release : 1977
Category : Aeronautics
ISBN :
Author : Technology Reports Centre (Great Britain)
Publisher :
Page : 540 pages
File Size : 40,41 MB
Release : 1977
Category :
ISBN :
Author : Cold Regions Research and Engineering Laboratory (U.S.)
Publisher :
Page : 178 pages
File Size : 11,2 MB
Release : 1981
Category : Engineering
ISBN :
Author :
Publisher :
Page : 2248 pages
File Size : 26,60 MB
Release : 1978
Category : Government publications
ISBN :
Author : Fred H. Kulhawy
Publisher :
Page : 852 pages
File Size : 16,45 MB
Release : 1969
Category : Technology & Engineering
ISBN :
Proceedings of the Congress sponsored by the Geotechnical Engineering Division and the Construction Division. Geotechnical Special Publication No. 22.